So, what is a media server?
A media server stores your film, television, home video and music files in one central place, then makes them available across your screens.
Your files may live on a NAS, a dedicated computer, a home server, or attached storage. From there, apps and playback devices let you browse and watch the collection on TVs, tablets, phones, laptops, home cinema systems and, in some cases, remotely when travelling.
Instead of digging through folders or plugging in drives, your library can appear in a cleaner interface with posters, descriptions, seasons, episodes and sensible organisation.
A media server does not supply films or shows. It simply organises and streams the media you already own in a more convenient way.